SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '856a0e89f97c763d667f24384ba777dd3fc67ee289ffb76de5f4b621e6d617d4' 
  AND token = 'A+hi+hjBY7JAYjQ/668xX/dm+uZj8RjqsxrY9NxduBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}